Is it possible to run the Arduino pro at 16 or 20 mhz? It has both of these numbers printed on the front of it (http://arduino.cc/en/Main/ArduinoBoardPro) indicating that it is possible but it is not obvious (at least to me) how this is accomplished.
In theory, the processor may not operate properly ay 16MHz when running from the 3.3V power supply used on the "pro." It might work, it might not. It might work at some temperatures and not others...
The "option" boxes you see on the board silkscreen are aimed at marking how the board was made AT MANUFACTURING TIME. MODIFYING the board to run at 16MHz might be tough; it would involve changing the resonator, a tiny SMT component soldered on the board.
Well thats no good. I really need a cheap alternative to leave in a project permanently (exactly what the pro was designed for) but that runs at the same speed as the development platform. I've always been a little curious what the reasoning for not running the pro boards at 16mhz was to begin with.
Thanks for the help
The dorkboard may be suitable for your project
http://www.dorkbotpdx.org/wiki/dorkboard
It is very small, runs at 16MHz and if you replace the 16MHz resonator with a 20MHz you may be able to run it at 20MHz
The dorkboard uses an ATmega168-20PU which can run at 20MHz but it is slowed to 16MHz by default
To run at 20MHz you may need to modify some arduino libs
The RBBB may be a good choice too